Heat transfer fluid characteristics (process coolants et al) have a direct and long lasting impact on system performance, production output, energy consumption, maintenance and down-time. Selecting an appropriate formulation, mixing ratio and compatible inhibitor package can be a daunting task for those not familiar with fluid thermodynamics, toxicity, corrosion chemistry and aerobic bacteria.
Hydratech have been assisting customers with fluid selection since 1998, utilising >100 years combined experience in all aspects of cooling and heating applications.
There are several detailed publications produced by CIBSE and BSRIA which provide excellent guidance on the commissioning (and recommissioning) of pipework systems. E.g. BSRIA BG29/2020 Pre-commission Cleaning of Pipework Systems explains the need to chemically clean and condition systems, to avoid premature corrosion and bacterial contamination.
Based on many years experience, it is not uncommon for the maintenance of cooling and heating systems to be overlooked. Under such circumstances various issues can develop, including; advanced corrosion, biological fouling and sediment formation. All of which will have a direct and negative impact on heat transfer, pumping performance and energy costs.
Ultimately, pipe-work corrosion can lead to failure, leaks and untimely shut-down. Prior to any remedial repairs it is likely the cooling and/or heating fluid will be drained-down and disposed of. And subsequently new fluid is needed to recommission the associated system. However, due to system contamination by corrosion, algae, sediment etc. any new fluid will also become contaminated. Therefore, it is recommended (necessary) that such systems are reconditioned prior to recommissioning.Hydratech are very familiar with the requirements of BG/29 and manufacture a range of cleansing and conditioning chemicals to help contractors and end-users meet those requirements.
Selecting an application-specific heat transfer fluid is the first important step in maximising system performance. It confirms an awareness of individual system design, thermal and pumping demands. And how energy efficiency (CoP) can vary according to fluid characteristics.
To sustain specified thermal and pumping performance, over extended periods of time, the fluid, pipe-work, heat-exchangers, pumps etc. should remain in 'as new' condition. I.E there should be no degradation of the mechanical or fluid components. This objective can be achieved provided;
Provided the above criteria are met, then the fluid and system should remain in good condition for years.
To verify long-term condition of the fluid and system, which directly affect efficiency, we recommend periodic analysis of the heat transfer fluid.
The Fluid Monitoring Program is complimentary for the first year after installation, to customers purchasing products directly from Hydratech, but subject to conditions. Specifically a maximum of two tests per year, per installation. If additional tests are required 'within the year' there may be a charge. Sample delivery charges are the customers responsibility.
Operation of the FMP is very straight forward. We supply customers with pre-packaged and labelled bottles for collecting and despatching of samples to our lab for periodic analysis. A report is provided for each fluid sample analysed which provides confirmation that the concentration, pH, Total Dissolved Solids, Turbidity etc. of the HTF are within acceptable limits. If any results are outside these limits we may recommend that a more in-depth test is carried out.
Each sample tested through the Fluid Monitoring Program has an associated report, which details all the relevant results together with any recommended actions. It is often possible to correct corrosion, scale and biological issues by adding appropriate doses of booster inhibitor(s). Hydratech manufacture many different inhibitor formulations for regular or shot dosing of closed loop cooling and heating systems.